I suspect the Jawbone UP24 I received is a counterfeit.In the US, there is only one size for headphone plugs and outlets.

The UP24 I received had a headphone plug that was, at most, two-thirds the size of a proper headphone plug. I know this for a fact because the "UP24" I ordered was for my mother and I compared the medium "UP24" I received to the small UP24 I already owned for myself, which works perfectly. In addition, the "UP24" I received did not power on, even after hours of charging. In sum, the "UP24" I received was both damaged and defective.

I sent multiple messages to zkarlo through eBay and only once did I receive a non-form response (the form responses merely directed me to fill out a return form), and in that one response zkarlo refused to accept responsibility for the 100% defective product it sold me.

I asked that shipping costs be covered for the return since I received what I believe to be a counterfeit item, but zkarlo ignored my requests by repeatedly replying with the exact same, word-for-word, message.

It is clear to me that zkarlo does not care about its customers or selling proper, working electronics.Buyer beware when you shop with zkarlo.

This reviewer shared experience about damaged or defective and wants this business to issue a full refund as the author lost $50. The author is overall dissatisfied with Zkarlo and uploaded picture s. The most disappointing about jawbone up24 from Zkarlo was defective product and form responses Reviewer wants customer support to reach out to him or her ASAP for further discussion of this matter.